Source Code Cross Referenced for SimpleQueueingDataFeed.java in  » Science » Cougaar12_4 » org » cougaar » qos » qrs » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.qos.qrs 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:         * <copyright>
004:         *  
005:         *  Copyright 2002-2007 BBNT Solutions, LLC
006:         *  under sponsorship of the Defense Advanced Research Projects
007:         *  Agency (DARPA).
008:         * 
009:         *  You can redistribute this software and/or modify it under the
010:         *  terms of the Cougaar Open Source License as published on the
011:         *  Cougaar Open Source Website (www.cougaar.org).
012:         * 
013:         *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
014:         *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
015:         *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
016:         *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
017:         *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
018:         *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
019:         *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
020:         *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
021:         *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
022:         *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
023:         *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
024:         *  
025:         * </copyright>
026:
027:         */
028:
029:        package org.cougaar.qos.qrs;
030:
031:        import java.util.HashMap;
032:        import java.util.HashSet;
033:        import java.util.Map;
034:        import java.util.Set;
035:
036:        import org.cougaar.util.CircularQueue;
037:
038:        abstract public class SimpleQueueingDataFeed extends AbstractDataFeed {
039:            private final Map<String, Set<DataFeedListener>> listeners;
040:            private final Map<String, DataValue> data;
041:            private final CircularQueue<String> queue;
042:            private final Runnable notifier;
043:
044:            private class Notifier implements  Runnable {
045:                public void run() {
046:                    String key = null;
047:                    DataValue value = null;
048:                    while (true) {
049:                        key = nextKey();
050:                        if (key == null) {
051:                            break;
052:                        }
053:                        value = lookup(key);
054:                        if (value == null) {
055:                            continue;
056:                        }
057:
058:                        notifyListeners(key, value);
059:                    }
060:                }
061:            }
062:
063:            protected Runnable makeNotifier() {
064:                return new Notifier();
065:            }
066:
067:            protected SimpleQueueingDataFeed() {
068:                listeners = new HashMap<String, Set<DataFeedListener>>();
069:                data = new HashMap<String, DataValue>();
070:                queue = new CircularQueue<String>();
071:                notifier = makeNotifier();
072:            }
073:
074:            protected String nextKey() {
075:                String next = null;
076:                synchronized (queue) {
077:                    if (!queue.isEmpty()) {
078:                        next = queue.next();
079:                    }
080:                }
081:                return next;
082:            }
083:
084:            protected boolean isEmpty() {
085:                synchronized (queue) {
086:                    return queue.isEmpty();
087:                }
088:            }
089:
090:            protected void dispatch() {
091:                notifier.run();
092:            }
093:
094:            protected Runnable getNotifier() {
095:                return notifier;
096:            }
097:
098:            public void removeListenerForKey(DataFeedListener listener,
099:                    String key) {
100:                Set<DataFeedListener> key_listeners = listeners.get(key);
101:                if (key_listeners != null) {
102:                    synchronized (key_listeners) {
103:                        key_listeners.remove(listener);
104:                    }
105:                }
106:            }
107:
108:            public void addListenerForKey(DataFeedListener listener, String key) {
109:                Set<DataFeedListener> key_listeners = null;
110:                synchronized (listeners) {
111:                    key_listeners = listeners.get(key);
112:                    if (key_listeners == null) {
113:                        key_listeners = new HashSet<DataFeedListener>();
114:                        listeners.put(key, key_listeners);
115:                    }
116:                }
117:                synchronized (key_listeners) {
118:                    key_listeners.add(listener);
119:                }
120:            }
121:
122:            protected void notifyListeners(String key, DataValue value) {
123:                Set<DataFeedListener> key_listeners = listeners.get(key);
124:                if (key_listeners != null) {
125:                    synchronized (key_listeners) {
126:                        for (DataFeedListener listener : key_listeners) {
127:                            listener.newData(this , key, value);
128:                        }
129:                    }
130:                }
131:            }
132:
133:            public DataValue lookup(String key) {
134:                return data.get(key);
135:            }
136:
137:            public <T> void newData(String key, T raw,
138:                    DataInterpreter<T> interpreter) {
139:                synchronized (data) {
140:                    DataValue old_value = lookup(key);
141:                    DataValue new_value;
142:                    double credibility;
143:                    if (interpreter != null) {
144:                        credibility = interpreter.getCredibility(raw);
145:                    } else {
146:                        credibility = ((DataValue) raw).getCredibility();
147:                    }
148:                    if (old_value == null
149:                            || old_value.getCredibility() <= credibility) {
150:                        if (interpreter != null) {
151:                            new_value = interpreter.getDataValue(raw);
152:                        } else {
153:                            new_value = (DataValue) raw;
154:                        }
155:                        data.put(key, new_value);
156:                    } else {
157:                        return;
158:                    }
159:                }
160:
161:                synchronized (queue) {
162:                    if (!queue.contains(key)) {
163:                        queue.add(key);
164:                        // XXX: Should the dispatch really keep the queue locked?
165:                        dispatch();
166:                    }
167:                }
168:            }
169:
170:        }
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